A Psychometric Evaluation of the Marijuana Problems Index Among College Students: Confirmatory Factor Analysis and Measurement Invariance by Gender

Renee M. Cloutier*, Prathiba Natesan Batley, Nathan T. Kearns, Ashley A. Knapp

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Although the Marijuana Problems Index (MPI) is widely used in studies with college student samples to reflect a unidimensional measure of cannabis-related problems, no studies have assessed the psychometric properties of the MPI in a college student population. The present study sought to resolve this gap in a sample of 879 college students reporting past-year cannabis use. Confirmatory factor analyses were used to test the factor structure of the unidimensional 23 and 18-item MPI and measurement invariance across gender. Bivariate correlations between the final factors, cannabis use history/frequency, and other substance use outcomes were used to examine concurrent and discriminant validities (i.e., vs. noncannabis outcomes). The 18-item (but not the 23-item) MPI demonstrated good model fit, measurement invariance across gender, adequate internal reliability, as well as concurrent and discriminant validities. Results support the use of the 18-item MPI over the 23-item MPI for conceptualizing problematic cannabis use, including the testing of gender-specific differences, among college students. Findings also reinforce the importance of evaluating the psychometric properties of widely used measures across samples.

Original languageEnglish (US)
JournalExperimental and Clinical Psychopharmacology
DOIs
StateAccepted/In press - 2021

Keywords

  • assessment
  • cannabis
  • gender
  • psychometrics
  • substance use

ASJC Scopus subject areas

  • Pharmacology
  • Psychiatry and Mental health
  • Pharmacology (medical)

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